Abstract
A laboratory-based Raman lidar has been tested for performance evaluation in atmospheric water vapour profiling and pollution monitoring. The range capability in daytime operation with the 308 nm output of a XeCl excimer laser is found to be limited by the variance of the scattered solar radiation. For night-time operation, the electromagnetic interference noise from the laser system limits the sensitivity or range capability. A real-time background noise subtraction technique has been implemented and its performance in reducing the EMI and the background pedestal is evaluated. The test results indicate that a Raman lidar using commercially available components is capable of atmospheric water vapour profiling over km ranges or monitoring several species of pollutants at ranges up to a few hundred metres.
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